US4785314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internally pressure-regulated ink supply
Assignee: Canon Inc
•
Filing: 1987-05-27
•
Granted: 1988-11-15
•
Expires: 2007-05-27
Abstract
Abstract A liquid ejection recording apparatus has a carriage, a liquid ejection recording unit, a lever biased by a spring for mounting the unit on the carriage, and a communication hole portion formed in an ink tank in the unit. When the unit is fixed on the carriage for printing, a projection presses the communication hole portion to provide a communication hole for communicating the interior of the ink tank with the outer atmosphere. Stable ink ejection is guaranteed without clogging of a nozzle or the like and regardless of the amount of ink remaining in the ink tank.
Inventors
- 👤 Koji Terasawa
- 👤 Akira Miyakawa
- 👤 Takehiko Kiyohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:21
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17503; B41J2/1752; B41J2/135; B41J2/165; B41J2/16517; B41J2/1652; B41J2/16526; B41J2/17553; G; G01; G01D; G01D15/00; G01D15/16; G01D15/18
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
107 words
A liquid ejection recording unit comprising: ink discharge means including means defining an orifice and means for discharging ink droplets from said orifice; ink containing means for containing ink to be supplied to said ink discharge means; an ink supply path having an end opening into said ink containing means for supplying ink from said ink containing means to said orifice; and pressurizing means provided on the inside of said ink containing means, at said end of said ink supply path opening into said ink containing means, for supplying pressurized ink to said ink discharge means in response to an external force acting on said pressurizing means.
Claim 2
Dependent Claim
107 words
A liquid ejection recording unit comprising: ink discharge means including means defining an orifice and means for discharging ink droplets from said orifice; ink containing means for containing ink to be supplied to said ink discharge means; an ink supply path having an end opening into said ink containing means for supplying ink from said ink containing means to said orifice; and pressurizing means provided on the inside of said ink containing means, at said end of said ink supply path opening into said ink containing means, for supplying pressurized ink to said ink discharge means in response to an external force acting on said pressurizing means.
Claim 3
Dependent Claim
24 words
A unit according to claim 1, wherein said pressurizing means is located on the lower portion of the inside of said ink containing means.
Claim 4
Dependent Claim
21 words
A unit according to claim 1, wherein said pressurizing means has a diaphragm and a press member for pressing said diaphragm.
Claim 5
Dependent Claim
21 words
A unit according to claim 1, wherein said pressurizing means has a bellows and a press member for pressing said bellows.
Claim 6
Dependent Claim
25 words
A unit according to claim 3, wherein an opening is formed in a portion of said diaphragm which contacts an end of said press member.
Claim 7
Dependent Claim
25 words
A unit according to claim 4, wherein an opening is formed in a portion of said bellows which contacts an end of said press member.
Claim 8
Dependent Claim
23 words
A unit according to claim 3, wherein said press member has a groove for communicating said ink containing means with the outer atmosphere.
Claim 9
Dependent Claim
23 words
A unit according to claim 4, wherein said press member has a groove for communicating said ink containing means with the outer atmosphere.
Claim 10
Dependent Claim
19 words
A unit according to claim 3, further comprising locking means for locking said press member at a predetermined position.
Claim 11
Dependent Claim
19 words
A unit according to claim 4, further comprising locking means for locking said press member at a predetermined position.
Claim 12
Dependent Claim
12 words
A unit according to claim 3, wherein said press member is tapered.
Claim 13
Dependent Claim
12 words
A unit according to claim 4, wherein said press member is tapered.
Claim 14
Dependent Claim
12 words
A unit according to claim 3, wherein said press member is stepped.
Claim 15
Dependent Claim
12 words
A unit according to claim 4, wherein said press member is stepped.
Claim 16
Dependent Claim
16 words
A unit according to claim 3, wherein said press member is treated with an ink-repellent agent.
Claim 17
Dependent Claim
16 words
A unit according to claim 4, wherein said press member is treated with an ink-repellent agent.
Claim 18
Dependent Claim
13 words
A unit according to claim 15, wherein the ink-repellent agent is ethylene tetrafluoride.
Claim 19
Dependent Claim
13 words
A unit according to claim 16, wherein the ink-repellent agent is ethylene tetrafluoride.
Claim 20
Dependent Claim
15 words
A liquid ejection recording apparatus including a liquid ejection recording unit according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |